Railroad lock nut fastener



FIG. 1 is a perspective view of a railroad lock nut fastener showing mynew design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof, the side and rearelevational views being identical; and,

FIG. 4 is a bottom plan view thereof.

The ornamental design for a railroad lock nut fastener, as shown anddescribed.